Tacking machine



F. POLZER TACKING MACHINE Nov. 28, 1933.

2 Sheets-Sheet 1 Filed March 4, 1931 7 I INVENTOR. Q W

A TTORNE YS.

F. POLZER TACKING MACH INE NOQ. 28, 1933.

2 Filed March 4, 1931 2 Sheets Sheet amnion Cut mag Patented Nov. 28, 1933 UNITED STATES,

TAOKING MACHINE Frldolin Polzcr, South Nor'walk, Coma, assignor to The E. H. Hotchkiss Company, Norwalk, Conn., a corporation of Connecticut 1 Application March 4, 1931. Serial No. 519.913 9 Claims. (01. 1-49) This invention relates to new and useful improvements in stapling or tacking machines such as are used for driving tacks or staples in securing tags or labels to packing boxes or the like or in securing paper to drawing boards and the like.

An object of the invention is to provide a tacking or stapling machine includinga guide bar for the tack or staple strip, a follower for the strip, and a relatively long coil spring extending or give under side pressure from a staple when the staple does not drive properly as, for example, when it is driven against a hard surface. An additional object is to provide a staple driving machine including a latching or fastening means adapted to retain the follower in retracted position against the action of the follower spring during the loading operation when replenishing-the suply of staples in the machine.

Other objects and advantages will become 0 apparent from a consideration of the following detailed description taken in connection with the accompanying drawings wherein a satisfactory embodiment of the invention is shown. It will, of course, be understood, that the invention is not limited to the details shown but includes all such variations and modifications as fall within the spirit of the invention and the scope of the appended claims to which claims reference is to be had for a definition of the invention.

In the drawings:

Fig. 1 is a side elevational view of the lin proved staple driving machine;

Fig. 2 is a vertical longitudinal sectional view through the same showing the follower secured in retracted position as when the machine is being loaded;

Fig. 3 is a front elevational view of the improved machine the hand portion of the plunger being omitted;

Fig. 4 is a rear elevational view thereof;

Fig. 5 is a side elevationalview of a portion of the machine showing the breech block open and showing in broken lines, a staple strip partially inserted;

' Fig. 8 is a front view Fig. 5;

Fig. '7 is a sectional view showing the location of the parts during the operation of driving a staple; a

Fig. 8 isa sectional view plunger elevated; and

' Fig. 9 is a detailed sectional view showing a guide pulley for the follower spring.

Referring in detail to the drawings, the im- 5 proved machine comprises a housing generally indicated at 10 including a base 11, upright portions 12 and 13, a lower or base housing portion 14, and a hollow upper bar or handle portion 15. On the base 11 is a guide bar 16 the same being enclosed on one side as by a portion 17 of the lower or base housing portion 14. At its other side the guide bar 16 is exposed as will be clear from a consideration of Figs. 1 and 4.

In the forward portion of the connecting or upright portion 12 of the housing or frame 10, there is disposed a. plunger 18 adapted to have the limit of its movements controlled as by means of the pin 19 carried by the housing and extending through the slot 20 in the plunger. The so plunger is normally maintained in extended position as shown in Figs. 1 and 2 as by means of a coil spring 21 partially received in a socket 22 in the lower portion of the plunger and.bearing against the stationary plate 23. end the plunger is provided with a head or hand portion 24 adapted to be engaged to depress the plunger during a stapling or tacking operation.

At its forward side, plunger 18 carries a staple driving plate 25 rigid with the plunger so as to move therewith. This driving plate 25 operates in the raceway 26 during the operation of driving a staple or tack. As 'will'be clear, from an inspection of Fig. 2,-the forward end of the guide bar 16 is atone side of the raceway 26, and pivoted in a recess in the raceway is a dog 2'? pivoted as at 28. The dog 27 is comprised in a means to prevent a second staple entering the raceway 26 before the first staple to enter the raceway has been driven' therefrom. This means is fully set forth in and forms the subject matter of application Serial Number 486,307, filed Oct.

It will be understood that staples are supplied to the machine in the form of a strip 29 (see Figs. 5, 7 and 8), and disposed on the guide bar 16 in a manner to normally urge the staple strip toward the raceway 26 is a follower 30. A relatively long coil spring 31 has one of its ends secured to the follower 30 as by means of the screw of the part shown showing the driving At its upper 85 the spring is of such length as to give a free and uniform action to the follower for its entire movement forwardly along the guide barlfi. Means are provided for manually retracting thefifollower against the action of thespring 31 and in a'mannor to tension said spring whereby to dispose the follower in its rearmostjposition to permit of the insertion into the machine of anew staple strip. This means as shown comprises a finger piece or projection 36 on the side of the follower and: exposed at the side of the guide bar as clearly shown in Figs.:1 and 4. A stop pin 3'7 may be provided at the rear end of the guide bar-to prevent the .follower'from beingmoved out of the machine. The follower is of substantially inverted U-shape in cross section so as to straddle. the guide bar 16 and be guided thereby.

The action of the dog or pivoted member 27 will probably best be understood with reference to Figs. 2, 7 and 8. Fig. 2 shows the position of the dog when the follower is retracted. Fig. 8 shows the position of the dog when there are staples in the machine and the follower is active. Here it will be seen that the plunger 18 and plate 25 are in elevated or retracted position and that spring pressed follower has urged the staples against the dog 27 in a manner to rock the same about its pivot 28. Fig. 7 discloses the action when the plunger 18 and driving plate 25 are depressed, a partially driven staple being indicated at 38 just before leaving the raceway 26. It will be seen that this staple has engaged the lower portion of the dog 27 and rocked the same about its pivot in a direction opposite that in which the dog is moved due to the spring 31. In Fig. 7 the upper portion of the dog has acted to move the staple strip rearwardly and it will accordingly be impossible for an additional staple to enter the raceway 26 until the staple 38 has been entirely driven therefrom and the plunger and plate have returned to normal position. The plate at its lower end is bifurcated to accommodate the dog 27. a

The machine of the present invention is adapted to be loaded from the front and to this end the machine includes a front breech block or member 39 pivoted at 40 and adapted to be released and moved about its pivot or on its pivot from the position shown in Figs. 1 and 3 to the positions shown in Figs. 5 and-6, respectively. The breech block 39 carries the dog 2'7 and it will also be apparent that the breech block forms or closes one side of the raceway 26.

It will be understood that the breech block 39 is swung to open position when a new strip is to be inserted into the machine and on the guide bar 16. Normally, the breech bar is closed as shown in Figs. 1 and 3 and the breech block is secured in this position. The securing means includes a somewhat disc like plate 41- pivoted as at 42 to the front wall of the machine. The upper portion of the breech block is notched as at 43 to receive the curvededge 44 of the plate 41 whereby to lock. the block -in .closed position plate 41 whereby to hold' the same'agalnst casual it with its edge'side lowermost as probably best shown in Fig.v 6 whereby to permit the breech Further, secured in the notch in the face of machine, as by means-of a screw 45; is a springw -,member 46 having its lower endout-turnedas at 47 and adapted to engage-in the notch 48 inthe s movement;

At eaclrside of its flat edge portion 49 the plate'41 carries an'ear 50 adapted to be engaged as by the fingers to'tum the plate and dispose bloclcto be openedJOf course, after. the machine is loaded the breech block is moved to normal or closed positionand the plate 41 is rotated back to normal position to secure. the breech block.

Since the breech block pivot $0 is disposed at the "lower side or portion of the breech block it will be apparent that the block will not be forced open should a staple become jammed in the raceway 26 as might happen should an attempt be made to drive the staple into a hard object. For example, should a staple be driven against a nail and crumple and attempt to move laterally in the raceway, it will be securely held and there will be little, if any, likelihood of the breech block'being forced open. Also should the staple hit a hard spot'in the wood the breech block would not yield and the staple would be more likely to be properly driven.

Since the machineis to be loaded from the front when the breech block 29 is opened or lowered it will be understood that the follower is drawn rearwardly on the guide bar 16 into the position shown in Fig. 2 during the loading operation. I have provided means .for latching or locking the follower in this rear or retracted position during the loading operation in order that the staple strip may-be easily inserted into the staple machine. The means as herein shown comprises a latch member 51 pivoted as at 52 and 115 engaged at its upper side as by means of a coil spring 53 partially disposed in a socket 54. The lower end of the member 51 may be shaped as at 55 and this lower end engages or is adapted to engage the forward side of the head of the screw 32 as clearly shown in Fig. 2 to secure the follower in retracted position.

It will be noted with particular reference to Fig. 2 that when the follower is secured by the latch member 51 the follower is spaced inwardly or forwardly of the stop pin 37. Therefore, when the upper portion of the latch member 51 is pressed inwardly against the action of spring 53 the end 55 of the latch member will tend to move the follower in a direction towards the pin 37 13c and when the screw head 32 has moved back a slight distance the same will be released from the latch and the follower will be moved forwardly into active engagement with the staple strip.

Having thus set forth the nature of my invention, what I claim is:

1. In a staple driving machine, a guide means for a staple strip, a follower for feeding a staple strip along said guide means, a handle spaced 14!) from said guide means and having a relatively long opening therein, a passage connecting the forward portion of the guide means with the forward portion of the opening in the handle, a relatively long coil spring secured to the follower to 145 move the same forwardly of the guide means, and said spring extending into the handle and having one end anchored therein in the rear portion thereof.

2.. In a staple driving machine including a 3150 tween the forward portion of the guide means and the forward portion of the interior of the handle, a relatively long spring secured at one end to the follower to move the same forwardly of the guide means, and said spring extending through the communicating passage and hollow portion of the handle and having its other end anchored in the rear portion of the hollow handle.

3. In a staple driving machine, a housing, said housing having a raceway in its forward portion, a plunger operable in said raceway to drive the staples therethrough, a guide bar for a staple strip having its forward end disposed to deliver staples to the raceway, a follower on said guide bar, spring means connected with the follower to urge the same along the guide bar in the direction of the raceway, a breech block forming one side of the lower portion of the raceway, means securing the lower portion of the breechblock to the housing and pivotally mounting the breech block whereby it may be swung downwardly to expose the end of the guide bar to permit of the insertion of a staple strip therein, and means to engage the upper portion of the breech block to secure the same in operative position.

4. In a staple driving machine including a housing, said housing having a raceway in its lower forward portion, a plunger operable in said raceway to drive staples therethrough, a guide means for a staple strip having its forward end disposed to deliver staples to the raceway, a follower on said guide means, spring means connected with the follower and normally urging the same along the guide means in the direction of the raceway, a breechblockforming the lower side of one side of the raceway, said breech block at the lower portion of said raceway having rearwardly extending portions, pivotal means located rearwardly of said raceway and mounting the breech block through the rearwardly extending portions thereof whereby the breech block may be swung downwardly to expose the end of the guide means to permit of the insertion of a staple strip, and means to engage the upper portion of the breech block to secure it in closed position.

5. In a staple driving machine including a housing having a raceway and a guideway a1;- ranged substantially at right angles to the raceway and adapted to deliver staples to the raceway, a breech block normally closing the lower portion of one side of the raceway. and means arranged substantially at right angles to the raceway and pivoting said breech block adjacent its lower end whereby it may be swung downwardly upon its pivot to expose an end of the guideway to permit of the insertion of a staple strip therein.

6. In a staple driving machine, a housing, a staple strip guide means in the housing, a movable plunger at the forward end of the guide means for driving the individual staples, a breech block forwardly of the plunger, a substantially horizontally arranged means pivoting the lower portion of the breech block to the housing whereby the breech block is adapted to swing downwardly to expose the forward end of the guide means and permit insertion of a staple strip, and means for feeding the strip forwardly toward the plunger.

7. In a staple driving machine, a housing, a staple strip guide means in the housing and opening through the front thereof, a movable plunger at the forward end of the guide means for driving the individual staples, a block normally closing the forward end of said guide means and pivoted to the housing below said guide means so as to swing downwardly to permit insertion of a staple strip, means for releasably holding the block in elevated position, and means for feeding the strip forwardly along the guide means.

8. In a staple driving machine, a housing, a staple strip guide in the housing and open at the front thereof, a movable plunger at the forward end of the guide for driving the individual staples, a block normally closing said guide and mounted a to be moved away therefrom to permit insertion of a staple strip, a pivoted pawl mounted-on the block adapted to engage the forward staple on a strip in the guide and prevent its moving forward while another staple is being driven, and means for feeding the staple strip forward along the guide.

9. In a staple driving machine, a housing, a staple strip guide means in the housing with its forward end open at the front of the housing, a raceway in the housing at the forward end of said guide means, a movable plunger in the raceway to 120 drive in the individual staples, a block for closing the forward end of the guide means and movable to one side to permit insertion of a staple strip, means carried by the block adapted to engage a staple strip to prevent its forward movement and 125 controlled by a staple in the raceway, and means for feeding a staple strip forwardly toward the plunger.

FRIDOIIN 30 

